A.L.
When I pumped at work about 3x a day (I did it for 9 months) I would just rinse them out in the bathroom sink after each time I was done. Then every night I would use one of the Medela Microwave Sterilization bags to totally sterilize all of the parts (not the hoses though). I know you can buy the bags at target. It seemed to work well that way!